<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>天气案例</title>
    <script src="../js/vue.js"></script>
</head>

<body>
    <div class="app">
        <h2>今天天气{{info}}</h2>
        <button @click="changeWeather">切换天气</button>
    </div>
    <script type="text/javascript">
        Vue.config.productionTip = false //阻止 vue 在启动时生成生产提示
        const vm = new Vue({
            data() {
                return {
                    isHot: false
                }
            },
            computed: {
                info() {
                    return this.isHot ? 'hot' : 'cold'
                }
            },
            methods: {
                changeWeather() {
                    this.isHot = !this.isHot
                }
            },
        })
        vm.$mount('.app')
    </script>
</body>

</html>